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vboccanfuso
30 Posts |
 Posted - 18 Sep 2008 : 11:29:51
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Hi,
I've got a half-duplex 485 device (flowmeter) that only has the following RS485 inputs: A, B & Ground. It does not have CTS or RTS. In topic 616, akidder says hardware handshaking has to be enabled. Is this still true in my case where there are no CTS and RTS lines to connect to? If so, do I have to tie these lines on my board to VCC or VDX?
FYI, I'm got a Sphere II dev kit with the latest CE image (5.00.23). |
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ljoy
22 Posts |
Posted - 19 Sep 2008 : 16:21:13
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| Vince, what are you hoping to accomplish? |
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vboccanfuso
30 Posts |
Posted - 19 Sep 2008 : 16:29:14
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quote:
[i]Originally posted by ljoy[/i]
[br]Vince, what are you hoping to accomplish?
I'm trying to get my RS485 device talking to my Sphere II. My question really delves into the techincal details of setting up RS-485 communications. |
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vboccanfuso
30 Posts |
Posted - 23 Sep 2008 : 17:55:12
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| Does anyone know if the RS485 transmit-enable and receive-enable lines have to be manually set in software when transmitting and receiving or is this handled automatically by the CE driver once hardware handshaking is enabled? I ask the question becuase I'm able to send data from my Sphere II, but can't receive it and am wondering if the problem is that my RS485 transceiver has not been configured for receiving becuase the enable lines have not been manually set. |
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vboccanfuso
30 Posts |
Posted - 02 Oct 2008 : 08:40:53
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Here is reply from EuroTech on 9/25/08;
Hi Vince,
This has just been routed to me. Sphere II does not support RS 485 on COM 3. Our TX_EN line is always enabled. We meant to post that information on the Forums a couple of weeks ago but haven’t had the chance yet.
So instead, you can use COM3 with RS 422 by setting the jumpers on J6 and J7 as described in the user’s manual.
Sorry if this is not the answer you were hoping for.
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Connecting to 485 Device without flow control
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